calibre is a ebook library management application. Its features are divided into the following categories:
Library Management
Format conversion (all major ebook formats can be converted from)
Syncing to ebook reader devices
Fetching news from the web and converting it into ebook form
Viewing many different ebook formats
Giving you access to your book collection over the internet using just a browser

A new wireless device driver. This allows connecting wirelessly to a device running a 'smart' calibre client
The wireless connection functions just as if the device was plugged into the computer by USB cable. Currently, Android devices are supported.

und die v. 1.19, z.B.
Edit book: A new tool to insert special characters into the text
Edit book: When searching for text in the editor, center the found text on screen
Edit book: Show tooltips in the File Browser for 'special' files, such as the cover, opf, ncx, etc.
...

Edit book: Add a tool to check spellings, access it via Tools->Check spelling
The calibre book editor now has builtin spellcheck. You can install new dictionaries via Preferences->Editor->Manage spelling dictionaries. It comes with builtin dictionaries for English and Spanish. You can add OpenOffice dictionaries (in .oxt format). The tool checks spellings in all HTML/OPF/NCX files in the book, taking into account any language declarations in the book, so that it will work correctly on multi-lingual books as well. The code is very new, so there may well be bugs. As you type spell checking is not yet implemented.

Kobo driver: Support firmware version 3.3

Device driver for Tolino Vision on windows

Bug Fixes

Amazon metadata download: Fix Editorial Reviews not downloading into the comments section for some books

DOCX Input: Fix some text highlighting colors in the DOCX file not being correctly translated during conversion.

Wireless device driver: Fix incorrect syncing behavior when book matching is run for a second time while connected. This happens when the user changes the library or selects 'Update cached metadata on device'.

Searching: Fix searching by date not using the system locale to interpret dd/mm vs mm/dd dates on windows

E-book viewer: When in flow mode, handle swiping on the touchscreen differently. Swiping now scrolls line by line in flow mode instead of page by page. If you wish to scroll page by page in flow mode, tap instead of swiping.

Conversion: Preserve all guide entries that are of a type present in the EPUB 2.0 specification. These entries are used by newer Kindle readers to populate the Go To jump list.

When adding MOBI files if the author name is in LN, FN format, auto change it to FN LN format, as the MOBI format has no author sort field. This behavior can be disabled by setting Preferences → Tweaks → Author sort name algorithm to copy.

Spell check: When checking French text list all words that have the same stem as a single word. So j'aime and aime are listed as a single word.

v. 1.40, u.a.:
Edit Book: Add a new tool to manage fonts. Allows easily changing/removing/embedding fonts in the entire book
Edit Book: Allow the color of the links in the Live CSS panel to be themed.
E-book viewer: Add a keyboard shortcut to bookmark current location.

calibredb: Add a new 'embed_metadata' command to update metadata in the actual book files in the calibre library from the calibre database.

Edit Book: Allow customization of toolbars

Add empty book: When adding empty book records to the library, add an option to also create empty EPUB files. Useful if you intend to subsequently edit these files with the calibre editor. You can access the add empty books feature by right clicking the Add Books button.

Book details panel: Make series and tags clickable. Clicking on them will search the calibre library for all books in the same series/ having the same tag

Edit metadata dialog: Improve performance by only writing changed fields to the database when clicking OK or Next

AZW3 Input: When converting from AZW3 files, use the high quality version of the image if the source AZW3 file contains both low and high quality images. These dual azw3 files are produced by kindlegen 2.9

Edit Book: When right clicking on a link in the editor add a menu entry to open the link

Edit Book: Search and replace panel: Add arrows to open the list of recently used search and replace expressions